Checking boost pressure of turbocharger
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09—425 Checking boost pressure of turbocharger
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Test value
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Boost pressure at full-load, driving
range position ,,L” or ,,S” and n = 4000/min
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0.7-0.8 bar gauge pressure
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Special tool
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fY-i
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Tester 0—1.6 bar gauge pressure
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617 589 02 21 00
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j
-£& no
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Conventional tester
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Digital tester (or revolution counter installed in vehicle)
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e.g. Bosch, MOT 001.03
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Checking
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A. On boost air pipe
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Connect boost pressure tester to intake manifold, unscrewing plug for this purpose.
Note: Tester connecting thread M 10 x 1.
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B. On switchover valve
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Connect boost air tester to switchover valve with Y-distributor, output of switchover valve.
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1 Pressure line to boost air pipe
2 Switchover valve
3 Pressure line to ALDA capsule
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09.8-425/1 F 3
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1 Test on dynamometer.
Drive vehicle in driving range ,,S” at full-load and n = 4000/min. The prescribed boost pressure must be obtained.
Check the trouble-shooting hints if system fails to reach specified boost pressure.
2 Road test.
Note: The full-load test must be kept as short as possible because the total driving energy has to be absorbed by the vehicle’s own brakes.
Road-test the vehicle in driving range ,,L” or ,,S” at full-load and n = 4000/min, placing tester in vehicle interior for this purpose. Accelerate to full throttle while holding at 4000/min with the aid of service brakes (No. 2 in illustration). The prescribed boost pressure must be reached.
Check the trouble-shooting hints if system fails to reach specified boost pressure.
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Compressor inlet (fresh air) Compressor outlet (pre-compressed air)
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Exhaust gases toward turbine wheel Exhaust gas outlet
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Function diagram
2 Compressor wheel 11
7 Turbine wheel 14
8 Boost pressure control valve 15
9 Connecting hose 20 10 Exhaust manifold 21
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Boost air pipe a
ALDA-capsule b
Pressure line c
Pressure switch boost air pipe Switchover valve overload protection
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Fuse terminal 15
Switching unit overload protection
Exhaust gas toward bypass duct
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09.8-425/2 F 3
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